Diamond Craters
"Diamond Craters volcanic field consists of a 60 sq km area of basaltic lava flows and numerous cinder cones and maars located between the SE Oregon town of Burns and Steens Mountain. A basaltic pahoehoe lava field is overlain by deposits from phreatomagmatic and strombolian eruptions that formed a late-stage central vent complex of about 20 craters and cones that densely fill a 1.1 x 1.6 km box-shaped caldera. The age of Diamond Craters is constrained to within 8400-6400 calibrated radiocarbon years Before Present by dated floodplain deposits below the lava flows and the oldest tephra deposit in a maar erupted through the lava flow (Sherrod 2011, pers. comm.). Structural doming at Diamond Craters has created a series of six overlapping topographic highs. The highest of these is known as Graben Dome; its 1435-m-high summit is cut by a NW-SE-trending graben 0.4 x 2.1 km long and 30 m deep. Lava flows on the eastern side of the volcanic field and scattered cinder cones and maars formed during the last stage of activity."  -Smithsonian Volcano Archive
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